Align model to camera view
If it's aligning the view to an object or element you're after, explore the ShiftNumpad 1, ShiftNumpad 3 and ShiftNumpad 7 combinations.
They will align the view down the selected element's Y, X, and Z axes, respectively.

If the element is an object, that's down the object's axes, towards its origin.
If a face, Z is down its normal, X and Y look straight across its plane.
If it's an edge, Y looks straight down it, and X, Z, align the edge
parallel to the screen,
and finally, if a vertex, Z looks straight down the vertex normal,
and the others bring the vertex normal parallel to the screen.

Adding Ctrl to the key combinations gives you the reverse angles of the above.
CtrlAltNumpad 0 will align the active camera to whichever view you are in.